Israel reminded of God's just judgments on Jerusalem; a small remnant
spared

In the revelation given to Ezekiel Jerusalem is taken, and its
population almost entirely destroyed. The dispersed remnant are
pursued by the sword, and a portion only of this remnant is spared.
There would be some even of this portion cast into the fire [1] . And
this fire should reach to the whole house of Israel. That is to say,
the judgment that should fall upon the remnant who do not perish in
the city should represent the position of all Israel. It is thus that
the prophet is constantly led to speak of the whole nation. For, as
long as there was a remnant at Jerusalem, the nation had a place on
the earth. But when the iniquitous rebellion of Zedekiah had led to
the destruction of Jerusalem, this was no longer the case. But this
judgment of Jerusalem contains very important elements for the
understanding of all this part of the history of the people and of the
dealings of God, "This is Jerusalem, saith the Lord Jehovah; I
have set it in the midst of the nations and countries round about
her." And instead of being a testimony in the midst of the
nations, so that the house of Jehovah should have attracted them, or
at least have placed them under responsibility by a true testimony to
God who dwelt there -- instead of this, her inhabitants had even gone
beyond the idolatrous nations in wickedness. Therefore God would
execute judgments upon her in the sight of all the nations -- a just
retribution for her sins. She should also be laid waste and made a
reproach among the nations round about her; and (chap. 6) the judgment
should not be confined to Jerusalem, it should be executed on all the
high places, on all the mountains of Israel. Every city should be
desolate, all their idols destroyed, and the people scattered. They
should know that the Lord had not threatened them in vain with His
judgments. The fire should reach those that were afar off as well as
those that were in the land; and the land should be laid waste, and
the worshippers of idols slain around their infamous
gods. Nevertheless God would remember mercy in the midst of judgment;
He would spare a little remnant of those who were scattered, and those
who should escape should loathe themselves for the abominations they
had committed. Thus Jerusalem was judged as well as the mountains of
Israel, which were but too notorious for their idols and their high
places.

[1] It is thus that I understand this passage. We should imagine,
from our translation, that it was some of the hairs that were cast
into the fire. But in the Hebrew the pronoun is in the singular, and
it is masculine as well as feminine.